Territory



`(No Model.)

A. J. BURR.

ROLLER DREDGB. Y N0. 273,021. Paten-'ted Feb.27, 1883.

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ATTORNEYS,

NA PETERS. Phulvliliwgrayiler. Washington. D. C.

UNITED STATES lPATENT OFFICE.

`ANDREW BURR, OF OLYMPIA, WASHINGTON TERRITORY.

ROLLER-DREDGE.

SPECIFICATION forming part of Letters Patent No. 273,021, dated February 27, 1883. Application inea september 21, rss2. (No model.)

To all whom it may concern:

Be it known that I, ANDREW J BURR, a citizen of the United States, residing at Olympia, in the county of rlrhurston, Washington Territory, have invented a new and useful Improvement in Roller-Dredges, of which the following is a specification. Y

My invention relates to improvements in dredging-machines for use under water in leveling and removing ridges and bars from river and harbor beds, the same being towed by a steamboat or other suitable power to drag it on the ridge or bar to be removed, by which means the earth or whatever constitutes the ridge or bar is loosened, so that the current of water may wash it away.

To this end my invention consists of a rollerdredge constructed as hereinafter fully described and set forth, reference being had to the accompanying drawings, in Which- Figure l is a central horizontal section of my invention, part in elevation. Fig. 2 is a sideelevationof the same, part in section; and Figs.3 and 4 are detail views of different styles of teeth, showingalso the mode of f'astening the same to the roller-disks.

A represents the shaft, upon which the disks B are firmly secured by means usual for such purposes, such as set-screws or slots and keys.

G C are the diggingor dredging teeth, proi ated radially relative to each other in the disk,

through which holes a. a e c bolts are, passed to firmly secure the tooth-shanks to one side of the disk, the. tooth proper projecting beyoud the disk, as shown. The. holes c ot the inner circle are elongatedto allow the bolt at the end of the tooth-shank to be set along, so as to give the desired pitch to the tooth relative to the circle of the disk.

llhe ends of the shaft A are journaled in a frame, E, like an old-styled road-roller, and this frame is provided with a vchain to attach the implement to a steamboat or other motive power, by which means the roller is dragged over the bar which is to be removed,advanc1ng in the plane of the disks, which revolve by Contact with theearth. The shaft A may be of any suitable length, supplied with any desred number of disks, and each disk may have any suitable number of teeth secured to it.

To meet different emergencies I provide two styles ot' teeth, one of which is spoonshaped,

as in Fig. 3, the concavity facing to the front,

and the other, like a cultivator-tooth, concave at the rear, asin Fig. 4, while pointed forward.

The advantage of this invention over the common drag-barrow or gang-plow for loosening sand-bars, &c., in river-bottoms is, principally, that while the harrow or .plow really anchors the boat to which it is tied as soon as the teeth bury in the earth, this rolling dredge, as its name indicates, rolls while it digs, thus passing over the ground which it digs up without any unnecessary expenditure of power on the part of the steamboat hauling it. It also carries the sand or mud in the spoons up to the top of the dredge, thus giving the current of water more opportunity to wash itaway than if merely stirred on the bottom of the stream, and by the teeth or spoons being secured to the disks` the water may pass between and carry away the rile, instead of f0rming an eddy for the rile to settle in, as a drum would do.

Having thus described my invention so as to enableothers skilled in the art to construct and operate the. same, what I claim as my invention, and wish to secure by Letters Patent,

l. The combination, with the frame E, the shaft A, journaled therein, and the disks B, skecured on said shaft, of the teeth C, shaped like spoons or' like cultivator-teeth, secured to said disks, as shown and described.

2. The combination, with one or more disks, B, suitably mounted to lorm part of a dredging-machine, of the curved teeth O, provided with biperforated flattened shanks c, secured to the face of said disk by two bolts passing through both shank and disk, as shown and described.

3. The disk B, suitablyinounted to form part ofa `dredging-machine, said disk being provided with two concentric circles of holes, e e', paired radially, iucombiuationwith teeth O, provided with hiperforated shanks c, each hole e' ofthe inner circle in disk B being elongated to allow the bolt a at the end of shank c to beset at different angles around bolt e as a center, for the purpose of giving any desired pitch to the tooth, as shown and described.

, ANDREW J. BURR.

Witnesses: A

NAT. CROSBY, CHAs. W. HARTMAN.

IOO 

